Am I overreacting?

So I’ve had this weird feeling for a little bit about my husband and what he’s doing on his phone since he is on it all evening. I mean, from the time we gets home for work, until he goes to sleep. I finally got on it to just check and the first thing I see is he deleted texts between him and his baby mama and had it on silenced. Then I saw that he sends screenshots of our conversations (basic talks and serious talks) to his mom. On top of that, on Friday I had asked him if he had plans this weekend because I wanted to record a video of us revealing the gender of our baby. I’m currently 14 weeks pregnant. He said he has plans Saturday. So then I decided Saturday I went an hour away to see my mom and grandma since he had plans. He told me he was going to his moms which is 45 min away. Also the same city his child’s mother lives in. For reference, she’s 22, he’s 26 and I’m 24. Well, I saw texts that he was with his 4 year old child and the mother but then he was texting his mom saying he was ready for her to leave because she was talking so much about her sex life. He never once told me he was going to go spend the day with his kid or the mother. Lastly, I ended up staying the night at my

Grandma. I had an extra pair of clothes with me in case I got dirty (she lives in the country) but Before I decided to stay, I texted my husband and asked if it was okay. He said yes and encouraged me to stay the night because I’d come home in the morning anyways. But then I see him texting his mom that he’s mad I stayed the night and saying I had a bag and planned on staying there anyways. I brought all this up to him and I even cried some because it hurts to know he’s hiding things from me, not communication about being around the child’s mother (like staying to hang out for hours and her talking about her sex life) and on top of that, I guess his mom was around at some point because he told his mom to not tell his child’s mother that I’m pregnant. In his wife and we’ve been married for over a year. And when I brought it up to him, he just said “so you really went through my phone??” And went back in our bedroom to play Xbox with his online friends. I think the hardest thing to know is him wanting to hide me pregnant …please tell me if I’m overreacting. I don’t have a problem if I am in the wrong here but I’m very hurt at the moment and feel almost stabbed in the back by my own husband…

For reference, after I already found out I was pregnant, I found out my husband cheated. He was texting, calling, FaceTiming and sexting this girl for a few days. I found out because she thought he was being weird and found him on Facebook and then messaged me. So him not telling me about spending hours with his baby mother is like a trigger almost